TDF Tip #5: Correct Tire Pressure
Check the sidewall of your tire for the recommended pressure. Keep in mind that the ideal road bike and mountain bike tire pressure includes a number of factors. Check out this guide to help you decide what fits your cycling needs.
When investing in a bike pump, look for one that fills both schrader and presta valves and has a handy pressure gauge.

https://spokester.com/blogs/news/bike-tire-pressure-quick-guide-to-the-right-psi-for-bike-tire